.mt-offcanvas{
  position: fixed;
  z-index: -1;
  visibility: hidden;
  margin: 0 auto;
  min-height: 1em;
  min-width: 1em;
  max-width: 450px;
  &_mask-transparent.active ~ .mt-offcanvas-mask { opacity: 0;}
  &-inner{
    opacity: 0;
    transition-property: all;
    transition-duration: 300ms;
  }
  &-center{
    top: 50%; left: 50%; transform: translate3d(-50%, -50%, 0);
    .mt-offcanvas-inner{
      transition-duration: 500ms;
      transition-timing-function: cubic-bezier(0.4, 0, 0, 1.5);
      &__slide-in-top{ transform: translate3d(0, -100%, 0); }
      &__slide-in-bottom{ transform: translate3d(0, 100%, 0); }
      &__zoom-in{ transform: translate3d(0, 0, 0) scale3d(1.25, 1.25, 1.25); }
    }
  }
  &-top{
    top: 0; left: 0; right: 0; bottom: auto; transform: translate3d(0, 0, 0);
    .mt-offcanvas-inner{  transform: translate3d(0, -100%, 0); }
  }
  &-bottom{
    top: auto; left: 0; right: 0; bottom: 0; transform: translate3d(0, 0, 0);
    .mt-offcanvas-inner{ transform: translate3d(0, 100%, 0); }
  }
  &-left{
    top: 0; left: 0; right: auto; bottom: 0; transform: translate3d(0, 0, 0);
    .mt-offcanvas-inner{ transform: translate3d(-100%, 0, 0);  height: 100%;}
  }
  &-right{
    top: 0; left: auto; right: 0; bottom: 0; transform: translate3d(0, 0, 0);
    .mt-offcanvas-inner{ transform: translate3d(100%, 0, 0); height: 100%;  }
  }

  &-top,&-bottom,&-center,&-left,&-right{
    &__show{
      .mt-offcanvas-inner {
        transform: translate3d(0, 0, 0) scale3d(1, 1, 1);
        opacity: 1;
      }
      ~ .mt-offcanvas-mask { opacity: .6;}
    }
  }
  &.active{
    visibility: visible;
    z-index: 2000;
    ~ .mt-offcanvas-mask {
      visibility: visible;
      z-index: 1000;
    }
  }
  &-mask{
    position: fixed;
    z-index: -1;
    visibility: hidden;
    top: 0;bottom: 0;
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
    background-color: #000;
    opacity: 0;
    transition: opacity .4s linear;
    transform: translateZ(0);
  }
}